A fourth-round pick in 2017, Mack ran 93 times for 358 yards and three touchdowns as a rookie. According to the Indianapolis Star, Mack finished his rookie season second in the league in percentage of runs that went for no yards or less (32.2 percent). That's one out of every three rushes that ended at or behind the line of scrimmage. Those are the strikeouts. The homers? He was tops in the NFL in 20-yard runs (5.4 percent of his total carries). There's no doubt Mack added an explosive layer to a Colts unit that sorely needed it. With Frank Gore's departure, Mack should get more work this season despite the presence of steady veteran Robert Turbin and the additions of Nyheim Hines in Round 4 and Jordan Wilkins in Round 5 of April's draft. Mack underwent off-season shoulder surgery to repair a torn labrum but is expected to be fully-healthy by training camp. All that said, Mack has excellent upside if he can prove the ball security woes he's dealt with since his days in college are behind him and his time working behind Gore has helped him mature between the tackles.

Marlon Mack 2017 Outlook

Mack, who was taken in the fourth round of the 2017 NFL Draft, should have a chance to carve out a situational role in 2017 playing behind veterans Frank Gore, Robert Turbin and newly-signed Christine Michael. Mack started all 36 games he appeared in during his three years at the University of South Florida and set 14 school records. He finished as USF's all-time leader in rushing yards (3,609) and rushing touchdowns (32). While the real question at this point is whether Mack is the team's running back of the future, the Indy Star believes the newcomer instantly offers the Colts' one-dimensional offense something it's long craved: Big-play potential from the run game. Gore has been superb in two seasons -- scraping out every yard he could behind the Colts' inconsistent and often underperforming line -- but the backfield has undeniably lacked sizzle. The team generated only four runs of 20 yards or longer in 2016. That's good enough for dead last in the NFL. Six of Mack's 15 rushing touchdowns last season went for 43 yards or more. That's exactly what the Colts need. Redrafters probably shouldn't leap right in, but Dynasty owners need to take note.